Chris Seal (cseal++at++sirapgc.demon.co.uk)
Tue, 18 Apr 95 12:19:18 GMT
>PS No one answered our last question about how to get the stereo
>images to pop out of the display. On our projected display, they end
>EXACTLY on the surface of the screen. If someone could point us in the
>right direction, we have lots of code and expertize that we could
>trade with them.
I'm a bit confused here, but if your images show objects EXACTLY on the
screen surface, then you DON'T have stereo. Is it possible that your left and
right eye
images are taken from the same viewpoint? In general you need 2 viewpoints, a
set distance
apart, which share a common gaze direction (i.e 2 views parallel to
eachother). Each view
should be skewed so that they meet at a distance which would define your
screen plane.
This is best done using asymmetric projections. Objects which are in front of
the
convergence plane should pop-out.
It should be noted that the foreground in a stereo display is often less
usable than the background.
This is because eye-strain can result from the eyes having to look cross-eyed
whilst
focussing at a further distance (the screen). In general the foreground is
more usable
when;
i) the screen is large and a more than a few metres away
ii) the field of view is large (stops object being cut-off by the screen
limits)
iii) the objects are moving and are not too far in the foreground for too long.
iv) the objects appear to have some physical support/connection back to
objects near the
screen plane
The other thing that should be pointed out is that there is a limit to the
maximum distance usable
in the background. If 2 corresponding points in the left and right images
have a physical separation
on the screen of more than about 60mm then you asking the viewer to diverge
their eyes! This is
not an easy thing to do ;-)
This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:51:24 PDT